Over the past 24 hours the first official round of the Facebook Hacker Cup
was held, with thousands of qualified competitors competing for one of (at least) 500 spots to participate in round 2. There was a nice spread in topics for the problems and their difficulty was much more balanced than in the qualification round, which made for quite an enjoyable match with many competitors solving all three problems.
Like last week, I will analyze the problems in order of increasing difficulty. Spoilers abound, so don't read on if you want to try to solve the problems yourself
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